File Extension APP

  • Full name
    MAC Application Package Or Core System Service Format
  • Developer
  • Popularity
Have you encountered a problem with a APP file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a APP file here. In the further part of this page we have added a list of programs that should open your APP file. It is enough you choose a proper application for your operating system, download and install it.

What is APP file?

The APP extension is used by the Apple Macintosh OS X operating system to identify executable applications. These can simply be started by double-clicking. They resemble the exe files under Microsoft Windows.

More info

The file is a container that contains the actual executable files. This file is displayed under Mac OS X as a single executable file. In Microsoft Windows, however, as a folder with the suffix app, which contains the files of the application.

These files may be infected with malware and should therefore be tested with an antivirus program.

Programs which can open a APP file

How to open file with APP extension?

In order to open a file with APP extension one of the following programs must be installed on user’s system. If a problem with opening APP file occurred, it is highly possible that none of the listed programs is present on user’s system. Even if one or more said programs are installed, there may be issues related with given programs. In order to solve a problem with APP files, follow the instructions below.
Install Mac OS X or other program from the list

Most often resolving problems with opening APP files is very simple. Just install an appropriate program that supports such files. All of the listed programs support APP files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of APP files or offer file conversion options, but may not be capable of editing such files.

Set Mac OS X as the default program for opening APP files

It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate APP files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Mac OS X applications is not on the list, select "Browse" option in order to manually locate the directory where Mac OS X has been installed.


Check the section that lists most common problems with APP files

Sometimes problems with opening APP files may not lie with the application itself, but can arise due to other causes, such as:

  • File data is corrupted
  • APP files has been not been completely download from the internet (only a part of the data has been downloaded)
  • Currently used user account hasn’t been granted necessary privileges to open APP files (should that be the case, please contact your system administrator or IT specialist)
  • APP file was being copied from a corrupted storage device and is incomplete or data is corrupted. (Copying files from unknown or untrusted sources should be conducted with great care as such files may contain malicious software, which can damage your system)